If the marketing service asked about is based on the customer or purchaser subscribing to something, meaning that he pays a sum of money in return for getting some discount or reduction in prices of goods or services that the seller is offering, then this is a haram transaction. If the transaction is haram, then it is also haram for you to tell people about it or to help people deal with it. For more information, please see the long answer.

Among the du’as that may be recited when visiting the grave is: “Assalamu ‘alaykum ahl al-diyar min al-muminin wa’l-Muslimin, wa inna in sha Allah bikum lahiqun, as alu Allaha lana wa lakum al-‘afiyah.”